Auto Layout Constraint Help

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Hi,

I have a UIScrollView within a UIView and then two container views within the scroll view (see below):

Screenshot_2016_03_24_17_17_14.png601×745 13 KB

What I am trying to achieve is that the top container takes up X amount of the screen and then the container at the bottom takes up the rest & grows more if the content is larger than the available space.

However what I am getting is this at the moment (link to image below) - could anyone help?
http://postimg.org/image/dwpkzgd9n/

Thanks!